public void CompressImageData()
{
// Can be called implicitly by Layer.PrepareSave or explicitly by the
// consumer of this library. Since image data compression can take
// some time, explicit calling makes more accurate progress available.
if (imageDataCompressed)
{
return;
}
if (ImageCompression == ImageCompression.Rle)
{
var dataStream = new MemoryStream();
var headerStream = new MemoryStream();
var rleWriter = new RleWriter(dataStream);
var headerWriter = new PsdBinaryWriter(headerStream, Encoding.ASCII);
//---------------------------------------------------------------
var rleRowLengths = new UInt16[Layer.Rect.Height];
var bytesPerRow = Util.BytesPerRow(Layer.Rect, Layer.PsdFile.BitDepth);
for (int row = 0; row < Layer.Rect.Height; row++)
{
int rowIndex = row * Layer.Rect.Width;
rleRowLengths[row] = (UInt16)rleWriter.Write(ImageData, rowIndex, bytesPerRow);
}
// Write RLE row lengths and save
for (int i = 0; i < rleRowLengths.Length; i++)
{
headerWriter.Write(rleRowLengths[i]);
}
headerStream.Flush();
this.RleHeader = headerStream.ToArray();
headerStream.Close();
// Save compressed data
dataStream.Flush();
data = dataStream.ToArray();
dataStream.Close();
Length = 2 + RleHeader.Length + Data.Length;
}
else
{
data = ImageData;
this.Length = 2 + Data.Length;
}
imageDataCompressed = true;
}
/// <summary>
/// Compresses the image data.
/// </summary>
public void CompressImageData()
{
// Do not recompress if compressed data is already present.
if (ImageDataRaw != null)
{
return;
}
if (ImageData == null)
{
return;
}
if (ImageCompression == ImageCompression.Raw)
{
ImageDataRaw = ImageData;
this.Length = 2 + ImageDataRaw.Length;
}
else if (ImageCompression == ImageCompression.Rle)
{
RleRowLengths = new RleRowLengths((int)Rect.height);
using (var dataStream = new MemoryStream())
{
var rleWriter = new RleWriter(dataStream);
var bytesPerRow = Util.BytesPerRow(Rect, Layer.PsdFile.BitDepth);
for (int row = 0; row < Rect.height; row++)
{
int rowIndex = row * (int)Rect.width;
RleRowLengths[row] = rleWriter.Write(
ImageData, rowIndex, bytesPerRow);
}
// Save compressed data
dataStream.Flush();
ImageDataRaw = dataStream.ToArray();
}
Length = 2 + 2 * (int)Rect.height + ImageDataRaw.Length;
}
else
{
throw new NotImplementedException("Only raw and RLE compression have been implemented.");
}
}
